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EEJ MAIN Chemistry QUESTION #5519
Question 1
A water sample contains metals at ppm levels: Fe = 0.2, Mn = 5.0, Cu = 3.0, Zn = 5.0. Identify the metal that makes the water unfit for consumption.
  • Cu
  • Mn✔️
  • Fe
  • Zn
Correct Answer Explanation
Permissible limits in drinking water: Fe = 0.3 ppm, Cu = 2.0 ppm, Mn = 0.05 ppm, Zn = 5.0 ppm. Mn = 5.0 ppm far exceeds its permissible limit of 0.05 ppm, making it the main culprit. All others are within or at permissible limits.